DevForce Community Forum : Silverlight 5 bug when saving twice in a row http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce 2010 : Silverlight 5 bug when saving twice in a row Sat, 25 May 2013 05:05:01 -700 Wed, 11 Apr 2012 12:50:25 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=3374 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ Silverlight 5 bug when saving twice in a row : Hi Maciej,I reproduced the... http://www.ideablade.com/forum/forum_posts.asp?TID=3374&PID=13283#13283 Author: sbelini
Subject: 3374
Posted: 11-Apr-2012 at 12:50pm

Hi Maciej,
 
I reproduced the issue. The problem is that when you call:
 
designSlotImage.Image.EntityAspect.Delete();
 
The Image.EntityAspect.EntityState should change to Deleted rather then detached (i.e. assuming that the previous EntityState is Unchanged/Modified)
 
I actually verified the issue in both SL4 and SL5. I'll be filing a bug for this.
 
By the way, instead of checking:
 
if (designSlotImage.ImageId != null)
 
You should do:
 
if (!designSlotImage.ImageId.EntityAspect.IsNullOrPendingEntity)
 
You shouldn't rely on the FK having null value (while that might work for a Guid, it won't for an int)
 
Silvio.
]]> Wed, 11 Apr 2012 12:50:25 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3374&PID=13283#13283 Silverlight 5 bug when saving twice in a row : Hi Silvio,Of course my 'Reproduce'... http://www.ideablade.com/forum/forum_posts.asp?TID=3374&PID=13278#13278 Author: macgajos
Subject: 3374
Posted: 10-Apr-2012 at 11:10pm

Hi Silvio,

Of course my 'Reproduce' sample is invalid, it was supposed to look like this:

SetDesignSlotImage(myDesignSlotImage, imageData, () =>
{
SetDesignSlotImage(myDesignSlotImage, imageData, () =>{});
});

Sorry for confusion.

Regards,
Maciej
]]> Tue, 10 Apr 2012 23:10:29 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3374&PID=13278#13278 Silverlight 5 bug when saving twice in a row : Hi macgajos,This doesn't... http://www.ideablade.com/forum/forum_posts.asp?TID=3374&PID=13257#13257 Author: sbelini
Subject: 3374
Posted: 09-Apr-2012 at 4:16pm

Hi macgajos,
 
This doesn't seen like a bug.
 
What is happening is that you are calling SetDesignSlotImage twice and the method itself performs a save (which occurs async). So the second time aroud, the entities still haven't been saved, but have already been modified.
 
Your simplified code using NorthwindIB:
 
void MainPage_Loaded(object sender, RoutedEventArgs e) {
  _mgr.Orders.AsScalarAsync().First(orderOp => {
    var order = orderOp.Result;
    if (order.EmployeeID != null) {
      order.Employee.EntityAspect.Delete();
      order.Employee = null;
    }
 
    order.Employee = new Employee() { FirstName = "Silvio1", LastName = "Belini1" };
 
    _mgr.SaveChangesAsync(savedArgs1 => {
      if (savedArgs1.CompletedSuccessfully) {
        MessageBox.Show("saved ok");
      } else {
        MessageBox.Show(savedArgs1.Exception.Message);
      }
    });
 
    // second time around
 
    if (order.EmployeeID != null) {
      order.Employee.EntityAspect.Delete();
      order.Employee = null;
    }
    order.Employee = new Employee() { FirstName = "Silvio2", LastName = "Belini2" };
    _mgr.SaveChangesAsync(savedArgs2 => {
      if (savedArgs2.CompletedSuccessfully) {
        MessageBox.Show("saved ok");
      } else {
        MessageBox.Show(savedArgs2.Exception.Message);
      }
    });
  });
}
 
What exactly are you trying to accomplish by modifying the same entity twice, the second time being while the first SaveChanges call is still pending?
 
Regards,
   Silvio.
]]> Mon, 09 Apr 2012 16:16:54 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3374&PID=13257#13257 Silverlight 5 bug when saving twice in a row : Hi, I've found a bug in dev... http://www.ideablade.com/forum/forum_posts.asp?TID=3374&PID=13222#13222 Author: macgajos
Subject: 3374
Posted: 04-Apr-2012 at 8:23am

Hi, I've found a bug  in dev force for Silverlight 5. Please find the following function:

public void SetDesignSlotImage(DesignSlotImage designSlotImage, byte[] imageData, Action callback)
{
            // imageData is != null

            if (designSlotImage.ImageId != null)
            {
                designSlotImage.Image.EntityAspect.Delete();
                designSlotImage.Image = null;
            }

            designSlotImage.Image = new DomainModel.Image()
            {
                ImageData = imageData,
            };

            //Breakpoint 1
            SaveChanges(myManager, () =>
                {
                    //Breakpoint 2
                    callback();
          });
}

DesignSlotImage is a DB entity. 
Image is a DB entity.
The relationship is 0..1 to  many. Image has no navigation property for DesignSlotImage images. DesignSlotImage has nullable ImageId property and Image property.

If You run this method once, everything is ok. Unfortunately every two executions weird stuff happens:

Breakpoint 1 
designSlotImage.Image  is as it should be
Breakpoint 2 
designSlotImage.Image is detached, designSlotImage.ImageID is ok

as a result , third execution of the method will not remove an Image.

Reproduce?
Run 
SetDesignSlotImage(myDesignSlotImage, imageData, () =>{});
SetDesignSlotImage(myDesignSlotImage, imageData, () =>{});

Walkaround?
After saving changes manually assign image from cache:

SaveChanges(_persistenceGateway.LayoutsManager, () =>
{

designSlotImage.Image = 
myManager.Images.With(QueryStrategy.CacheOnly).First(p => p.Id == designSlotImage.ImageId);

//Note that myManager.HasChanges returns false at this point 

callback();
});


]]> Wed, 04 Apr 2012 08:23:19 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3374&PID=13222#13222